28321129 has 2 divisors, whose sum is σ = 28321130. Its totient is φ = 28321128.

The previous prime is 28321123. The next prime is 28321159. The reversal of 28321129 is 92112382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23503104 + 4818025 = 4848^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 28321129 - 2¹⁹ = 27796841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28321097 and 28321106.

It is not a weakly prime, because it can be changed into another prime (28321123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160564 + 14160565.

It is an arithmetic number, because the mean of its divisors is an integer number (14160565).

Almost surely, 2^28321129 is an apocalyptic number.

It is an amenable number.

28321129 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321129 is an equidigital number, since it uses as much as digits as its factorization.

28321129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 28321129 is about 5321.7599532485. The cubic root of 28321129 is about 304.8153643775.

It can be divided in two parts, 283 and 21129, that added together give a palindrome (21412).

The spelling of 28321129 in words is "twenty-eight million, three hundred twenty-one thousand, one hundred twenty-nine".